Error Code 429 - too many requests

[MatinF]

I'm using below function in an automated w3c validator script. It runs daily across ~200 URLs:

def validate_url(url):
    import requests, sys

    print("test url: ", url)
    validator_url = "https://validator.w3.org/nu/"
    params = {"doc": url, "out": "json"}
    r = requests.get(validator_url, params=params)

    if r.status_code != 429:
        results = r.json()["messages"]
    else:
        print("WARNING: Too many requests - exiting script")
        sys.exit()

    return results

This has worked with no issues for years, but last week it started failing with the error code 429, i.e. too many requests.

Has anyone else experienced something similar?

[bnadlerjr]

I'm having the same issue. My script doesn't run as often so I only first noticed it yesterday.

[LucasLarson]

It happens even if you use the old interface on validator.w3.org to validate this SVG.

It returns a similar 429-error message I have never seen before:

❌ Error External Checker not available
Checking the Document Type of this document requires the help of an external tool which was either not enabled in this validator, or is currently unavailable. Check in the validator's system configuration that HTML5 Validator is enabled and functional.
The error encountered was: 429 Too Many Requests